Joseph baedsley



JQBARDSLEY.

DOOR KN0B1 No. 314,644. Patented Mar'. 31, 18185.

A N f* f y i C, f1 W" i llamen rares armar @tirreno JOSEPH BARDSLEY, OF NEVARK, NEV JERSEY.

DOOR-KNOB.

SPECIFICATION forming part of Letters Patent No. 314,644-, dated March 3l, 1835.

Application tiled December 29, 1884. (No model.)

To all wcom- 15 may concern:

Be it known that l, JOSEPH BARDsLEY, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Door-Knobs, of which the following is a specification.

The invention relates to improvements in door-knobs; and it consists in novel methods of manufacture, as hereinafter described, and particularly pointed out in the claim. In Letters Patent of the United States No. 301,850, granted to me July l5, 1884. l have described and claimed a door-knob in the shank of which is a metallic sleeve, the sleeve being inserted into the shank and afterward threaded,where by it is effectually held in place and adapted to receive the threaded end of a knob-spindle, and in said patent- I reserved the right to make the method of manufacturing and securing the metal sleeve in the knob-shank the subject of a separate application for protection, thesaid patent being limited to the article, and the present application being presented for the purpose of covering the method of manufacture.

Referring to the accompanying drawings, Figure l is a central vertical longitudinal section of a pair of knobs embodying the elements of the invention. Fig. 2 is a vertical transverse section on the line x x of Fig. 1. Fig. 3 is a view of the sleeve prior to its insertion in the knob-shank. Fig. 4 is a central vertical longitudinal section of a door-knob, showing the formation of the knob-shank lining when a comparatively thick metal tube is used for same.

In the drawings, A denotes the door; B O, respectively, the knobs, and D the spindle, which passes through a suitable aperture in the doorand receives upon its ends the knobs. The knobs B G will preferably be of wood, and each will be provided with a suitable shank, E, within which is cut a socket, F, of suitable form and dimensions to snugly receive the metallic sleeve G prior to its being threaded. The sleeve G will preferably be provided with a longitudinal rib, H, which will enteraeorresponding groove in the socket F, and prevent the sleeve from turning during the process of threading, as hereinafter described, and while the knob is in use. After the sleeve G has been inserted into the socket F, it will be threaded by a suitable tool screwed therein, when it will be ready for insertion upon the ends of the threaded spindle D, where the knob will be retained by a screw, I, or other suitable device.

Heretofore in manufacturing wooden doorknobs great difficulty has been experiencedin securing a metallic sleeve in the knob-shank without making the latter unduly large and cumbersome or incurring great expense inthe manufacture. The object ofthe present invention is to produce a method whereby a metallic sleeve may be elfectually secured 'in the knob-shank in a rapid inexpensive manner, and without destroying the attractive appearance of the lock. The method of manufacture herein described, which consists in irstinserting the sleeve in the socket of the knob'shank and then threading it, is advantageousin many respects, among which may be mentioned the fact that it permits of the use of a longitudinal rib on a threaded sleeve, and that the operation of threading the sleeve afterits insertion into the knob-shank has the effect of expanding its sides against ythe walls of the socket receiving it, whereby the sleeve will be firmly held in place, and will be rendered more durable and effectual on account of its close contact with the walls of the socketin theknob-sl1ank- The exterior surface of the sleeve G will be more or less expanded into a thread by the operation of threading the interior portion thereof, according to the thickness and character 4of the metal employed, and at any rate the formation of the interior thread will expand the sleeve, so that it tightly impinges the walls of its socket. Fig. 4 shows the character of the threads formed when a thick metal tube is used for the lining of the knob-shank. The tube shown is expanded and a slight exterior thread formed, and it is firmly secured in place.

Cast-iron sleeves have heretofore been inserted in knobshanks; but these have been threaded prior to their insertion. The operation of threading has not assisted in securing the sleeve, and the sleeve has had no longitudinal rib.

It will be obvious that when thin metal is used for the sleeve G the rib Hmay be formed after the sleeve has been inserted into the knobshank by simply driving a ribbed tool into it, and in this case the rib will be pressed into the wood, and operate to prevent the sleeve from turning in its socket when the knob is in use. This method of manufacture may be followed, if desired; or when thick metal is used for the sleeve the rib and thread may be formed on it prior to its insertion into the knob-shank.

I dovnot, therefore, limit my invention to any particular order of following the steps of the invention; but

What I claim as new, and desire to secure by Letters Patent, is-

In the manufacture of door-knobs, the method of lining the knob-shank with metal, which comprises the following steps: giving the metal tube a longitudinal rib, inserting it 2o JOSEPH BARDSLEY.

W'itnesses:

CEAS. C. GILL, HERMAN GUsfrow. 

